WO2022102341A1 - Haut-parleur - Google Patents

Haut-parleur Download PDF

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Publication number
WO2022102341A1
WO2022102341A1 PCT/JP2021/038242 JP2021038242W WO2022102341A1 WO 2022102341 A1 WO2022102341 A1 WO 2022102341A1 JP 2021038242 W JP2021038242 W JP 2021038242W WO 2022102341 A1 WO2022102341 A1 WO 2022102341A1
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WO
WIPO (PCT)
Prior art keywords
diaphragm
phase plug
speaker
ribs
front surface
Prior art date
Application number
PCT/JP2021/038242
Other languages
English (en)
Japanese (ja)
Inventor
一樹 本田
将史 西田
純一 池田
一平 來山
Original Assignee
パナソニックＩｐマネジメント株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by パナソニックＩｐマネジメント株式会社 filed Critical パナソニックＩｐマネジメント株式会社
Priority to JP2022561355A priority Critical patent/JP7417914B2/ja
Priority to US17/919,715 priority patent/US20230142560A1/en
Priority to CN202190000431.1U priority patent/CN219145577U/zh
Publication of WO2022102341A1 publication Critical patent/WO2022102341A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R1/00—Details of transducers, loudspeakers or microphones
    • H04R1/20—Arrangements for obtaining desired frequency or directional characteristics
    • H04R1/32—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired directional characteristic only
    • H04R1/34—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired directional characteristic only by using a single transducer with sound reflecting, diffracting, directing or guiding means
    • H04R1/38—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired directional characteristic only by using a single transducer with sound reflecting, diffracting, directing or guiding means in which sound waves act upon both sides of a diaphragm and incorporating acoustic phase-shifting means, e.g. pressure-gradient microphone
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R1/00—Details of transducers, loudspeakers or microphones
    • H04R1/20—Arrangements for obtaining desired frequency or directional characteristics
    • H04R1/22—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired frequency characteristic only 
    • H04R1/24—Structural combinations of separate transducers or of two parts of the same transducer and responsive respectively to two or more frequency ranges
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R1/00—Details of transducers, loudspeakers or microphones
    • H04R1/20—Arrangements for obtaining desired frequency or directional characteristics
    • H04R1/22—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired frequency characteristic only 
    • H04R1/30—Combinations of transducers with horns, e.g. with mechanical matching means, i.e. front-loaded horns
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R2201/00—Details of transducers, loudspeakers or microphones covered by H04R1/00 but not provided for in any of its subgroups
    • H04R2201/34—Directing or guiding sound by means of a phase plug
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R2400/00—Loudspeakers
    • H04R2400/13—Use or details of compression drivers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R7/00—Diaphragms for electromechanical transducers; Cones
    • H04R7/02—Diaphragms for electromechanical transducers; Cones characterised by the construction
    • H04R7/12—Non-planar diaphragms or cones
    • H04R7/127—Non-planar diaphragms or cones dome-shaped
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R7/00—Diaphragms for electromechanical transducers; Cones
    • H04R7/16—Mounting or tensioning of diaphragms or cones
    • H04R7/18—Mounting or tensioning of diaphragms or cones at the periphery
    • H04R7/20—Securing diaphragm or cone resiliently to support by flexible material, springs, cords, or strands
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R9/00—Transducers of moving-coil, moving-strip, or moving-wire type
    • H04R9/06—Loudspeakers

Definitions

  • This disclosure relates to speakers.
  • Patent Document 1 discloses a speaker including a dome-shaped diaphragm and a phase plug arranged in front of the front surface of the diaphragm.
  • the phase of the sound wave generated from a part of the diaphragm facing the phase plug is matched with the phase of the sound wave generated from the other part of the diaphragm.
  • a dome-shaped diaphragm that curves convexly forward A cylindrical member in which the diaphragm is arranged and the inner diameter increases toward the front, and With a phase plug, located in front of the front of the diaphragm, The phase plug The front facing forward and The rear surface facing the central portion of the front surface of the diaphragm at a constant interval in parallel with the rear surface, A side surface connecting the front surface and the rear surface is provided. When viewed from the front and back of the speaker, the front surface of the phase plug is larger than the rear surface of the phase plug.
  • At least a part of the side surface of the phase plug extends forward and outward to face the inner peripheral surface of the cylindrical member and the front surface of the diaphragm, and the sound wave generated from the diaphragm.
  • a speaker is provided that includes an inclined surface that directs the tubular member toward the inner peripheral surface.
  • a dome-shaped diaphragm that curves convexly forward With a phase plug, located in front of the front of the diaphragm, The phase plug The front facing forward and The rear surface facing the central portion of the front surface of the diaphragm at a constant interval in parallel with the rear surface, A side surface connecting the front surface and the rear surface is provided.
  • the phase plug has a plurality of ribs on the side surface. Each of the plurality of ribs is provided with facing surfaces parallel to the front surface of the diaphragm and facing each other at a certain interval.
  • a speaker is provided in which each of the plurality of ribs projects outward beyond the outer peripheral edge of the front surface in the front-back direction of the speaker.
  • the sound quality can be further improved in a speaker provided with a dome-shaped diaphragm and a phase plug arranged in front of the dome-shaped diaphragm.
  • FIG. 1 Schematic perspective view showing the inside of the speaker according to the first embodiment of the present disclosure.
  • Exploded view of the sound generation unit of the speaker according to the first embodiment Partially enlarged cross-sectional view of the speaker including the phase plug according to the first embodiment.
  • Front perspective view of the phase plug according to the first embodiment Rear perspective view of the phase plug according to the first embodiment
  • Side view of the phase plug according to the first embodiment Rear view of the phase plug according to the first embodiment Schematic diagram of a speaker showing the first problem that occurs in a comparative speaker without a phase plug.
  • Sound pressure distribution diagram in the speaker of the first embodiment Sound pressure distribution diagram in a comparative speaker equipped with a dish-shaped phase plug.
  • Front perspective view of the phase plug according to the second embodiment Rear perspective view of the phase plug according to the second embodiment
  • Side view of the phase plug according to the second embodiment Rear view of the phase plug according to the second embodiment
  • Partially Enlarged Section of Speakers Included Phase Plugs According to Another Embodiment
  • FIG. 1 is a schematic perspective view showing the inside of the speaker according to the first embodiment of the present disclosure.
  • FIG. 2 is a cross-sectional view of the sound generation unit of the speaker according to the first embodiment.
  • FIG. 3 is an exploded view of the sound generation unit.
  • the speaker 10 has an enclosure 12 and an acoustic generation unit 14 provided in the enclosure 12.
  • the speaker 10 is a coaxial speaker, and as shown in FIGS. 2 and 3, the sound generation unit 14 includes a woofer 16 and a tweeter 18. Further, the sound generation unit 14 includes a frame 20 that supports the woofer 16 and a magnetic circuit 22 that supports the tweeter 18 and the frame 20. Further, the sound generation unit 14 includes a phase plug 24.
  • the woofer 16 extends from the diaphragm 26 toward the rear of the speaker 10, an edge for fixing the diaphragm 26 and the front end of the diaphragm 26 to the annular front end portion 20a of the frame 20. It includes a cylindrical voice coil bobbin 30, a voice coil 32 provided in the voice coil bobbin 30, a damper 34 that vibrates and supports the voice coil bobbin 30, and a magnet 36.
  • the diaphragm 26 of the woofer 16 is a cylindrical member whose inner diameter increases toward the front of the speaker 10, for example, a truncated cone-shaped member.
  • the diaphragm 26 is oscillatedly supported by the frame 20 via the edge 28 and the damper 34 so that the central axis of the shape coincides with the central axis C of the speaker 10 extending in the front-rear direction of the speaker 10.
  • the voice coil bobbin 30 vibrates in the front-rear direction due to the current flowing through the voice coil 32 arranged adjacent to the magnet 36 for the woofer 16 arranged in the magnetic circuit 22.
  • the diaphragm 26 of the woofer 16 connected to the voice coil bobbin 30 vibrates to generate sound waves.
  • the tweeter 18 includes a diaphragm 38, an edge 40 supporting the diaphragm 38, a cylindrical voice coil bobbin 42 extending from the diaphragm 38 toward the rear of the speaker 10, and a voice coil provided on the voice coil bobbin 42. 44 and a magnet 46 are included.
  • the diaphragm 38 of the tweeter 18 is a dome-shaped member that is curved forward.
  • the diaphragm 38 has a hemispherical shape.
  • the diaphragm 38 is oscillatedly provided on the top surface of the cylindrical portion 22a of the magnetic circuit 22 via the edge 40 so that the central axis of the shape coincides with the central axis C of the speaker 10.
  • the diaphragm 26 of the woofer 16 and the diaphragm 38 of the tweeter 18 are arranged coaxially (central axis C).
  • the cylindrical portion 22a of the magnetic circuit 22 is arranged in the voice coil bobbin 30 of the woofer 16.
  • the diaphragm 38 of the tweeter 18 is arranged in the diaphragm 26 of the woofer 16.
  • the voice coil bobbin 42 vibrates in the front-rear direction when a current flows through the voice coil 44 arranged adjacent to the tweeter 18 magnet 46 arranged in the magnetic circuit 22.
  • the diaphragm 38 of the tweeter 18 connected to the voice coil bobbin 42 vibrates to generate sound waves.
  • the phase plug 24 is arranged in front of the diaphragm 38 of the tweeter 18.
  • FIG. 4 is a partially enlarged cross-sectional view of the speaker including the phase plug according to the first embodiment.
  • 5 to 8 are a front perspective view, a rear perspective view, a side view, and a rear view of the phase plug according to the first embodiment.
  • the phase plug 24 has a front surface 24a facing forward, a rear surface 24b facing the front surface 38a of the diaphragm 38 of the tweeter 18, and a side surface 24c connecting the front surface 24a and the rear surface 24b. And prepare. Further, the phase plug 24 includes an annular attachment portion 24d attached to the top surface of the cylindrical portion 22a of the magnetic circuit 22, and a plurality of leg portions 24e connecting the side surface 24c and the attachment portion 24d.
  • the attachment portion 24d is an annular portion located outside the diaphragm 38 of the tweeter 18 and surrounding the diaphragm 38 in the front-rear direction of the speaker 10.
  • the leg portion 24e extends from the attachment portion 24d and supports the main portions (front surface 24a, rear surface 24b, side surface 24c) of the phase plug 24 in front of the diaphragm 38 of the tweeter 18.
  • the leg portion 24e is separated from the front surface 38a of the diaphragm 38 as compared with the rear surface 24b and the facing surface of the rib described later so as not to affect the sound quality.
  • the front surface 24a of the phase plug 24 is a surface portion that can be seen from the front of the speaker 10, and has a circular shape centered on the central axis C in the front-back direction of the speaker 10. Further, in the case of the first embodiment, the front surface 24a is a convex surface having a conical shape in a directional view orthogonal to the central axis C. The conical front surface 24a has an inwardly curved conical surface. Further, when viewed in the front-rear direction, the size of the front surface 24a is substantially equal to the size of the diaphragm 38 of the tweeter 18. The role of the front surface 24a of the phase plug 24 having such a conical convex surface will be described later.
  • the rear surface 24b of the phase plug 24 is a portion of the surface of the phase plug 24 that faces the central portion of the front surface 28a of the diaphragm 38 of the tweeter 18 at a constant interval d in parallel.
  • the interval d is, for example, 0.5 mm.
  • the role of the rear surface 24b of the phase plug 24 will be described later.
  • the side surface 24c of the phase plug 24 is a portion of the surface of the phase plug 24 that connects the front surface 24a and the rear surface 24b.
  • the front surface 24a of the phase plug 24 is larger than the rear surface 24b in the front-rear direction view of the speaker 10. Therefore, the side surface 24a of the phase plug 24 includes at least a partially inclined surface 24f extending outward while extending forward.
  • the inclined surface 24f faces the front surface 38a of the diaphragm 38 which does not face the rear surface 24b in the front-rear direction of the speaker 10, and the inclined surface 24f faces the inner peripheral surface 26a of the diaphragm 26 of the woofer 16.
  • the inclined surface 24f is a part of the side surface 24c and is connected to the front surface 24a. Further, in the case of the first embodiment, the inclined surface 24f is a curved surface curved outward in a direction orthogonal to the front-rear direction. The role of the side surface 24c of the phase plug 24 having such an inclined surface 24f will be described later.
  • the phase plug 24 includes a plurality of ribs 24g protruding rearward from the side surface 24c toward the front surface 38a of the diaphragm 38.
  • the plurality of ribs 24g are plate-shaped protrusions that are cantilevered and supported on the side surface 24c, and extend in the radial direction with respect to the central axis C in the front-rear direction view of the speaker 10.
  • each of the plurality of ribs 24g is provided with facing surfaces 24h which are parallel to the front surface 38a of the diaphragm 38 and face each other at a constant interval d.
  • the facing surface 24h and the rear surface 24b are continuous curved surfaces.
  • the plurality of ribs 24g do not project outward beyond the outer peripheral edge of the front surface 24a in the front-rear direction view of the speaker 10.
  • each of the plurality of ribs 24g has a shape in which the wall thickness increases toward the front of the speaker 10. That is, as shown in FIG. 7, the wall thickness t1 on the front side of the plurality of ribs 24g is larger than the wall thickness t2 on the rear side (diaphragm 38 side).
  • the facing surface 24h of each of the plurality of ribs 24g has a shape in which the width decreases toward the outside in the front-rear direction view of the speaker 10. That is, as shown in FIG. 8, the width w1 on the center side is larger than the width w2 on the outer side in the front-rear direction view of the speaker 10.
  • FIG. 9 is a schematic diagram of a speaker showing the first problem that occurs in the speaker of the comparative example in which the phase plug is not provided. Further, FIG. 10 is a schematic diagram of a speaker showing a second problem that occurs in the speaker of the comparative example.
  • the reach of the sound wave propagating forward from the tweeter dome-shaped diaphragm differs depending on the position where the sound wave is generated.
  • a reach distance difference ⁇ L1 is generated between the sound wave SW1 generated from the central portion of the diaphragm of the tweeter and the sound wave SW2 generated from the outer peripheral portion of the diaphragm of the tweeter.
  • This ⁇ L1 corresponds to the height H of the dome-shaped diaphragm.
  • the sound wave generated from the diaphragm of the tweeter has a different reach depending on whether or not it is reflected by the diaphragm of the woofer.
  • the difference ⁇ L2 is generated. This reach distance difference ⁇ L2 is determined by the tilt angle of the diaphragm of the woofer with respect to the front-rear direction of the speaker.
  • FIG. 11 is a diagram showing the sound pressure-frequency characteristics of the speaker of the comparative example in which the phase plug is not provided.
  • the solid line shows the measured value
  • the alternate long and short dash line shows the simulated value.
  • the dip occurs in the sound range A of 8000 to 9000 Hz, and the sound pressure level drops in the high range A of 15000 Hz or higher.
  • the term "dip" means that the sound pressure level in a certain range is lower than the level in the surrounding range.
  • the dip in the range A is caused by the second problem shown in FIG. 10
  • the decrease in the sound pressure level in the range B is caused by the first problem shown in FIG.
  • the audible range of a general human being is in the range of 20 to 20000 Hz.
  • the phase plug 24 in the speaker 10 of the first embodiment has a plurality of features as described above and as shown in FIG. 4 so as to suppress such deterioration of sound quality.
  • FIG. 12 is a schematic view of a speaker showing the effect of the rear surface of the phase plug according to the first embodiment.
  • the rear surface 24b of the phase plug 24 faces the central portion of the front surface 38a of the diaphragm 38 of the tweeter 18 at a constant interval d in parallel.
  • the sound wave SW1 generated from the central portion of the front surface of the diaphragm 38 of the tweeter 18 facing the rear surface 24b of the phase plug 24 passes through the gap between the phase plug 24 and the diaphragm 38. It propagates outward, and after exiting the gap, it propagates forward.
  • the first problem shown in FIG. 9 can be solved, that is, the arrival between the sound wave SW1 generated from the central portion facing the phase plug and the sound wave SW2 generated from the outer portion not facing the phase plug. The distance difference becomes smaller.
  • FIG. 13 is a schematic view of a speaker showing the effect of the side surface of the phase plug according to the first embodiment.
  • FIG. 14A is a sound pressure distribution diagram in the speaker of the first embodiment.
  • FIG. 14B is a sound pressure distribution diagram in a comparative speaker provided with a dish-shaped phase plug. In FIGS. 14A and 14B, the broken line indicates the boundary between different sound pressure levels.
  • the front surface 24a of the phase plug 24 is larger than the rear surface 24b in the front-rear direction view of the speaker 10.
  • the side surface 24c of the phase plug 24 includes at least a partially inclined surface 24f extending outward while extending forward.
  • the inclined surface 24f is a curved surface that is convexly curved outward in a directional view orthogonal to the front-rear direction of the speaker 10.
  • the sound waves generated from different positions of the tweeter 18 diaphragm 38 are directed not to the front but to the inner peripheral surface 26a of the diaphragm 26 of the woofer 16 by the side surface 24c of the phase plug 24. ..
  • the sound wave from the diaphragm 38 of the tweeter 18 propagates toward the inner peripheral surface 26a of the diaphragm 26 of the woofer 16 and propagates forward along the inner peripheral surface 26a. That is, the sound wave generated from the central portion of the diaphragm 38 of the tweeter 18 and the sound wave generated from the outer portion propagate along substantially the same path.
  • the sound wave is suppressed (delayed) from diffracting forward of the phase plug by the side surface 24c of the phase plug 24.
  • the sound wave propagates along the diaphragm of the woofer while maintaining the sound pressure level.
  • the comparative example shown in FIG. 14B since the phase plug has a thin dish shape, the sound wave is diffracted in front of the phase plug. As a result, the sound wave propagates along the inner peripheral surface of the diaphragm of the woofer while the sound pressure level decreases.
  • FIG. 15 shows simulated values of the sound pressure-frequency characteristics (solid line) of the speaker of the first embodiment and the sound pressure-frequency characteristics (single-point chain line) of the speaker of the comparative example not provided with the phase plug.
  • the side surface 24c of the phase plug 24 suppresses the generation of dips in the range A of 8000 to 9000 Hz. As a result, the sound quality is improved, and in particular, the color of the sound is improved.
  • the inclined surface 24f on the side surface 24c of the phase plug 24 is curved outward in a direction orthogonal to the front-rear direction of the speaker 10. It is a face, but it is not limited to this.
  • the inclined surface 24f may be linear in a direction orthogonal to the front-rear direction of the speaker 10.
  • a curved surface is preferable in order to suppress the diffraction of sound waves in front of the phase plug (delay the occurrence of the diffraction).
  • the entire side surface 24c may be an inclined surface 24f.
  • the side surface 24c of the phase plug 24 has a wall surface 24i extending from the rear surface 24b at least in the front-rear direction of the speaker 10 and at least outward from the wall surface 24i. It includes an eaves-shaped wall surface 24j that extends toward and connects to the inclined surface 24f.
  • the wall surface 24i extends outward from the rear surface 24b toward the wall surface 24j while extending forward, and the wall surface j extends outward from the wall surface 24i toward the inclined surface 24f and extends backward. It is extended to.
  • the sound wave emitted from between the rear surface 24b and the diaphragm 38 travels along the wall surface 24i from the outer peripheral end of the rear surface 24b, and travels along the wall surface 24j from the front end of the wall surface 24i.
  • the sound wave traveling along the wall surface 24i precedes the sound wave traveling along the diaphragm 26 of the woofer 16. However, the sound wave traveling along the wall surface 24i then travels outward along the wall surface 24i. Meanwhile, the sound waves traveling along the diaphragm 26 of the woofer 16 catch up. Specifically, at the timing when the sound wave traveling along the wall surface 24j reaches the inclined surface 24f, the diaphragm 26 of the woofer 16 is placed at a position in the front-rear direction substantially the same as the connection point between the wall surface 24j and the inclined surface 24f. Sound waves traveling along reach.
  • the sound wave traveling along the phase plug 24 and the sound wave traveling along the diaphragm 26 of the woofer 16 are aligned and proceed forward.
  • the path length of the sound wave traveling along the phase plug 24 can be adjusted.
  • the entire sound wave can travel toward the front of the speaker 10 with the phases aligned.
  • FIG. 16A is a diagram showing the propagation of the wavefront in the speaker of the first embodiment.
  • FIG. 16B is a diagram showing the propagation of the wavefront in the speaker of the comparative example provided with the flat plate-shaped phase plug.
  • FIGS. 16A and 16B two different wavefronts W1 and W2 are shown by a one-dot chain line and a two-dot chain line, and the wavefront W of the combined wave is shown by a broken line.
  • the front surface 24a of the phase plug 24 is a conical convex surface that protrudes forward in a direction perpendicular to the central axis C.
  • the conical front surface 24a has an inwardly curved conical surface.
  • FIG. 16A According to the front surface of such a phase plug, and due to the nature of sound waves propagating along the surface of the object such that the wavefront is orthogonal to the surface of the object, there are two different, as shown in FIG. 16A.
  • the wavefront W1 and W2 merge in front of the phase plug, the wavefront W of the combined wave becomes a wavefront that is uniformly curved forwardly over the entire surface.
  • FIG. 16B when the phase plug is plate-shaped, two different wavefronts W1 and W2 interfere on the front surface of the phase plug, and as a result, the wavefront W of the synthetic wave is in front of the phase plug.
  • the part that propagates in is a concave wavefront.
  • such a front surface 24a of the phase plug 24 suppresses a decrease in the sound pressure level in the high frequency range B of 15000 Hz or higher. As a result, the sound quality is improved, and in particular, the extension of the sound is improved.
  • each of the plurality of ribs 24g extends in the radial direction with respect to the center line C in the front-back direction view of the speaker 10. Further, each of the plurality of ribs 24g is provided with facing surfaces 24h which are parallel to the front surface 38a of the diaphragm 38 and face each other at a constant interval d.
  • the ratio of sound waves generated from various parts of the diaphragm 38 directly forward increases as the generation position moves away from the center. That is, as the generation position moves away from the center, the sound wave that propagates forward immediately through the plurality of ribs 24g increases, propagates through the gap between the facing surface 24h of the ribs 24g and the diaphragm 38, and then moves forward. The sound wave to go is reduced. Simply put, as the generation position moves away from the center, the number of short-cut sound waves increases and the number of detouring sound waves decreases.
  • the propagation path of the sound wave generated from the portion of the diaphragm 38 facing the facing surface 24h of the rib 24g heads forward after the sound wave exits the gap between the facing surface 24h and the diaphragm 38. Therefore, it is longer than the propagation path of the sound wave generated from the portion of the diaphragm 38 not facing the facing surface 24h and directly propagating forward. Due to the various lengths of the sound wave propagation path, the sound pressure level of each frequency reaching the measurement position in front of the speaker is flattened.
  • FIG. 17 shows simulated values of the sound pressure-frequency characteristics (solid line) of a speaker having a phase plug having a plurality of ribs and the sound pressure-frequency characteristics (single point chain line) of a speaker having a phase plug not having a plurality of ribs. Is shown.
  • the phase plug not provided with the plurality of ribs shown by the alternate long and short dash line is shown in FIG. 24, which will be described later.
  • the phase plug when the phase plug is provided with a plurality of ribs, the sound pressure level of each frequency reaching the measurement position in front of the speaker is flattened in the sound range of 30,000 Hz or less, and the sound quality is improved.
  • the meat of each of the plurality of ribs 24 g is used for finely adjusting the degree of flattening of the sound pressure level and the sound pressure level of a specific frequency.
  • the thickness and the width of the facing surface 24h of each of the plurality of ribs 24g are finely adjusted. As the wall thickness increases toward the front, the length of the propagation path of the sound wave propagating between the plurality of ribs 24g, specifically, the sound wave propagating near the ribs 24g becomes the sound wave propagating in the center between the ribs. It will be slightly longer than that.
  • the width of the facing surface 24h decreases toward the outside, a part of the sound wave propagating in the gap between the facing surface 24h and the diaphragm 38 reaches the outer end of the facing surface 24h. , It slips out between multiple ribs.
  • the sound quality can be further improved in the speaker provided with the dome-shaped diaphragm and the phase plug arranged in front of the dome-shaped diaphragm.
  • FIG. 18 is a partially enlarged cross-sectional view of the speaker including the phase plug according to the second embodiment.
  • 19 to 22 are a front perspective view, a rear perspective view, a side view, and a rear view of the phase plug according to the second embodiment.
  • the phase plug 124 in the speaker according to the second embodiment has a front surface 124a facing forward, a rear surface 124b facing the front surface 138a of the tweeter diaphragm 138, and a front surface 124a.
  • a side surface 124c connecting the rear surface 124b, an annular attachment portion 124d attached to a magnetic circuit, and a plurality of leg portions 124e connecting the side surface 124c and the attachment portion 124d are provided.
  • the front surface 124a and the rear surface 124b have substantially the same size when viewed in the front-rear direction of the speaker. Therefore, the side surface 124c extends outward while extending forward, and includes a flat inclined surface in a directional view orthogonal to the front-rear direction. However, the inclined surface has a small inclination angle with respect to the central axis C of the speaker, and is substantially parallel to the central axis. Therefore, the side surface 124c of the phase plug 124 according to the second embodiment is generated from the diaphragm 138 of the tweeter, unlike the curved side surface 24c which is convex to the outside of the phase plug 24 according to the first embodiment. It plays almost no role of directing the generated sound wave toward the inner peripheral surface 126a of the diaphragm 126 of the woofer.
  • the size of the front surface 124a of the phase plug 124 is smaller than that of the diaphragm 138 when viewed in the front-rear direction of the speaker.
  • the plurality of ribs 124g provided on the side surface 124c of the phase plug 124 project outward beyond the outer peripheral edge of the front surface 124a in the front-rear direction of the speaker, and substantially in the direction from the side surface 124c toward the diaphragm 138. Not protruding.
  • Each of the plurality of ribs 124g is provided with facing surfaces 124h that face each other in parallel with the front surface 138a of the diaphragm 138 at regular intervals. In the plurality of ribs 124g, some ribs (three ribs in the case of the second embodiment) are overlapped and integrated with the plurality of legs 124e in the front-rear direction of the speaker.
  • the sound wave propagating forward between the plurality of ribs 124g (that is, the sound wave generated from the portion of the diaphragm 138 that does not face the facing surface 124h of the ribs 124g and the facing surface 124h).
  • the sound wave generated from the portion of the diaphragm 138 facing the surface and after exiting from the gap between the facing surface 124h and the diaphragm 138) is substantially directed toward the diaphragm 126 of the woofer by the side surface 124c of the phase plug 124. It propagates forward as it is while maintaining the sound pressure level without being reflected by.
  • the decrease in the sound pressure level is suppressed at the measurement position in front of the speaker.
  • the role of the side surface 24c of the phase plug 24 in the above-described first embodiment that is, the role of suppressing the generation of dips in the range of 8000 to 9000 Hz can be complemented. Therefore, according to the plurality of ribs 124g, it is possible to provide the side surface 124c of the phase plug 124 in parallel with the central axis C of the speaker.
  • the configuration of the phase plug 124 in the second embodiment is such that when the diaphragm 126 of the woofer is a flat plate or has a shape with a loose inclination angle, that is, the inner diameter of the diaphragm increases as the tweeter diaphragm moves forward. It is effective when it is not placed in the diaphragm.
  • the second embodiment as described above can further improve the sound quality in the speaker provided with the dome-shaped diaphragm and the phase plug arranged in front of the dome-shaped diaphragm.
  • the third embodiment is an improved form of the second embodiment described above. Therefore, the third embodiment will be described with a focus on different points.
  • FIG. 23 is a partially enlarged cross-sectional view of the speaker including the phase plug according to the third embodiment.
  • the phase plug 224 in the speaker according to the third embodiment has a front surface 224a facing forward, a rear surface 224b facing the front surface 238a of the tweeter diaphragm 238, and a front surface 224a and a rear surface 224b. It is provided with a side surface 224c for connecting the above.
  • the side surface 224c extends outward while extending forward, similar to the side surface 224c in the phase plug 224 according to the first embodiment described above. It includes an inclined surface 224f.
  • the inclined surface 224f is a curved surface that is curved outward in a direction orthogonal to the front-rear direction of the speaker.
  • the size of the front surface 224a of the phase plug 224 is smaller than that of the diaphragm 238 when viewed in the front-rear direction of the speaker.
  • the plurality of ribs 224g provided on the side surface 224c of the phase plug 224 project outward beyond the outer peripheral edge of the front surface 224a when viewed in the front-rear direction of the speaker.
  • the plurality of ribs 224 g project toward the diaphragm 238.
  • phase plug 224 According to such a phase plug 224, the effect of the side surface 224c of the phase plug 24 according to the first embodiment and the effect of the plurality of ribs 124g of the phase plug 124 of the second embodiment can be obtained. That is, the sound wave generated from the portion of the diaphragm 238 that overlaps the front surface 224a of the phase plug 224 in the front-back direction of the speaker can be directed to the diaphragm 226 of the woofer.
  • the sound wave generated from the portion of the diaphragm 238 that does not face the facing surface 224h of the rib 224g passes forward between the plurality of ribs 224g. Then, it propagates forward as it is.
  • the sound wave generated from the portion of the diaphragm 238 facing the facing surface 224h of the plurality of ribs 224g and emitted from the gap between the facing surface 224h and the diaphragm 238 also has a sound wave between the plurality of ribs 224g. It passes forward and propagates forward.
  • the above-described third embodiment can further improve the sound quality in the speaker provided with the dome-shaped diaphragm and the phase plug arranged in front of the dome-shaped diaphragm.
  • each of the phase plugs of the speaker according to the above-described first to third embodiments has a plurality of ribs.
  • the embodiments of the present disclosure are not limited to this.
  • FIG. 24 is a partially enlarged cross-sectional view of a speaker including a phase plug according to another embodiment.
  • the phase plug 324 in the speaker according to another embodiment is substantially the same as the phase plug 24 according to the first embodiment except that it does not have a plurality of ribs. That is, when viewed in the front-rear direction of the speaker, the front surface 324a is larger than the rear surface 324b, whereby the side surface 324c includes an inclined surface 324f extending outward while at least partially extending forward. Further, the front surface 324a is a convex surface having a conical shape in a directional view orthogonal to the central axis C. The conical front surface 324a has an inwardly curved conical surface.
  • the side surface 324c allows the dip in the sound range of 8000 to 9000 Hz. Can be suppressed.
  • the front surface 324a can suppress a decrease in the sound pressure level in the high frequency range of 15,000 Hz or higher. That is, the sound quality improving effect of the phase plug 24 according to the first embodiment can be partially enjoyed.
  • the number of the plurality of ribs 24g and 124g is the plurality of legs 24e. It is larger than the number of 124e.
  • the embodiments of the present disclosure are not limited to this.
  • the number of a plurality of ribs and the number of a plurality of legs may be the same. In this case, the ribs and the legs may be overlapped and integrated in the front-rear direction of the speaker.
  • the front surface 24a of the phase plug 24 is a conical convex surface in a directional view orthogonal to the central axis C, and the conical front surface 324a is inside. It has a convexly curved conical surface.
  • the embodiments of the present disclosure are not limited to this.
  • FIG. 25 is a partially enlarged cross-sectional view of a speaker including a phase plug according to still another embodiment.
  • the front surface 424a of the phase plug 424 in the speaker according to still another embodiment is orthogonal to the central axis C, similarly to the front surface 24a of the phase plug 24 according to the first embodiment shown in FIG. It is a conical convex surface in the direction of the speaker.
  • the conical front surface 424a of the phase plug 424 has an outwardly curved conical surface.
  • the diaphragm 426 of the woofer has a shape corresponding to the front surface 424a of the phase plug 424, that is, a shape that is convexly curved toward the center.
  • the shape of the front surface of the phase plug and the shape of the diaphragm of the woofer are required. We need to work together. Therefore, the shape of the front surface of the phase plug is changed based on the shape of the diaphragm of the woofer, as shown in FIG.
  • the speaker 10 is a coaxial speaker including the woofer 16 and the tweeter 18, as shown in FIG.
  • the embodiments of the present disclosure are not limited to this. That is, the tubular member in which the dome-shaped diaphragm is arranged and the inner diameter increases toward the front is not limited to the diaphragm of the woofer, and may be, for example, a horn of an enclosure.
  • a dome-shaped diaphragm curved forward and a tubular member in which the diaphragm is arranged and the inner diameter increases toward the front.
  • a phase plug arranged in front of the front surface of the diaphragm, the phase plug has a constant distance parallel to the front surface facing forward and the central portion in the front surface of the diaphragm.
  • the front surface of the phase plug is larger than the rear surface of the phase plug in the front-rear direction of the speaker, and the side surface of the phase plug is provided with a rear surface facing open and a side surface connecting the front surface and the rear surface.
  • At least a part of the above extends forward and outwards to face the inner peripheral surface of the tubular member and the front surface of the diaphragm, and the sound sound generated from the diaphragm is emitted from the tubular member. It is a speaker that includes an inclined surface toward the inner peripheral surface of the speaker.
  • another embodiment of the present disclosure has, in a broad sense, a dome-shaped diaphragm curved forward and a phase plug arranged in front of the front surface of the diaphragm, and the phase is described.
  • the phase comprises a front facing forward, a rear surface facing the central portion of the front surface of the diaphragm in parallel at regular intervals, and a side surface connecting the front surface and the rear surface.
  • the plug comprises a plurality of ribs on the side surface, each of the plurality of ribs having facing surfaces parallel to the front surface of the diaphragm and facing each other at a certain interval, and each of the plurality of ribs has a plurality of ribs facing each other. It is a speaker that protrudes outward beyond the outer peripheral edge of the front surface in the front-rear direction of the speaker.
  • the present disclosure is applicable to a speaker having a dome-shaped diaphragm and a phase plug arranged in front of the diaphragm.

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  • Engineering & Computer Science (AREA)
  • Health & Medical Sciences (AREA)
  • Otolaryngology (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Multimedia (AREA)
  • Obtaining Desirable Characteristics In Audible-Bandwidth Transducers (AREA)

Abstract

L'invention concerne un haut-parleur comportant : une membrane en forme de dôme qui est incurvée de manière convexe vers l'avant ; un élément cylindrique dans lequel la membrane est disposée et dont un diamètre interne augmente vers l'avant ; et un obturateur de phase qui est disposé à l'avant d'une surface avant de la membrane. L'obturateur de phase comporte : une surface avant qui est orientée vers l'avant ; une surface arrière qui fait face en parallèle à une partie centrale de la surface avant de la membrane tout en présentant un intervalle fixe entre elles ; et une surface latérale qui relie la surface avant et la surface arrière. Vue du haut-parleur dans la direction avant-arrière, la surface avant de l'obturateur de phase est plus grande que la surface arrière. Au moins une partie de la surface latérale de l'obturateur de phase comprend une surface inclinée qui s'étend vers l'avant et vers l'extérieur et qui fait face à une surface périphérique interne de l'élément cylindrique et à la surface avant de la membrane, et qui oriente des ondes sonores générées par la membrane vers la surface périphérique interne de l'élément cylindrique.
PCT/JP2021/038242 2020-11-10 2021-10-15 Haut-parleur WO2022102341A1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
JP2022561355A JP7417914B2 (ja) 2020-11-10 2021-10-15 スピーカー
US17/919,715 US20230142560A1 (en) 2020-11-10 2021-10-15 Speaker
CN202190000431.1U CN219145577U (zh) 2020-11-10 2021-10-15 扬声器

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JP2020187266 2020-11-10
JP2020-187266 2020-11-10

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WO2022102341A1 true WO2022102341A1 (fr) 2022-05-19

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US (1) US20230142560A1 (fr)
JP (1) JP7417914B2 (fr)
CN (1) CN219145577U (fr)
WO (1) WO2022102341A1 (fr)

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0231599A (ja) * 1988-06-02 1990-02-01 Boaz Elieli 電気音響変換器およびスピーカ
US20110085692A1 (en) * 2008-06-11 2011-04-14 Harman International Industries, Incorporated Dual compression drivers and phasing plugs for compression drivers
JP2012500535A (ja) * 2008-08-14 2012-01-05 ハーマン インターナショナル インダストリーズ インコーポレイテッド 直接放射ラウドスピーカのためのフェイズプラグおよび音響レンズ
US20120027238A1 (en) * 2005-12-22 2012-02-02 Harman International Industries, Incorporated Phasing plug for a compression driver
WO2012164866A1 (fr) * 2011-05-30 2012-12-06 パナソニック株式会社 Haut-parleur
US20130182879A1 (en) * 2012-01-18 2013-07-18 Curtis E. Graber Phase plug with axially twisted radial channels
US20180054671A1 (en) * 2016-08-22 2018-02-22 Harman International Industries, Inc. Compression driver and phasing plug assembly therefor
US20190028801A1 (en) * 2017-07-21 2019-01-24 Premium Loudspeakers (Hui Zhou) Co., Ltd. Combined-type phase plug, and compression driver and speaker using same

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0231599A (ja) * 1988-06-02 1990-02-01 Boaz Elieli 電気音響変換器およびスピーカ
US20120027238A1 (en) * 2005-12-22 2012-02-02 Harman International Industries, Incorporated Phasing plug for a compression driver
US20110085692A1 (en) * 2008-06-11 2011-04-14 Harman International Industries, Incorporated Dual compression drivers and phasing plugs for compression drivers
JP2012500535A (ja) * 2008-08-14 2012-01-05 ハーマン インターナショナル インダストリーズ インコーポレイテッド 直接放射ラウドスピーカのためのフェイズプラグおよび音響レンズ
WO2012164866A1 (fr) * 2011-05-30 2012-12-06 パナソニック株式会社 Haut-parleur
US20130182879A1 (en) * 2012-01-18 2013-07-18 Curtis E. Graber Phase plug with axially twisted radial channels
US20180054671A1 (en) * 2016-08-22 2018-02-22 Harman International Industries, Inc. Compression driver and phasing plug assembly therefor
US20190028801A1 (en) * 2017-07-21 2019-01-24 Premium Loudspeakers (Hui Zhou) Co., Ltd. Combined-type phase plug, and compression driver and speaker using same

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CN219145577U (zh) 2023-06-06
US20230142560A1 (en) 2023-05-11
JP7417914B2 (ja) 2024-01-19

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